[ExI] Cheaper alternative to solar roof panels?

[BillK]

On Fri, Oct 15, 2010 at 6:56 PM, BillK  wrote:
>
> Depending on factors such as climate, roof angle and house direction,
> the system should generate around 350 kWh heat per square meter (3
> square ft).
>
>

They've corrected an error in the article:

Depending on factors such as climate, roof angle and house direction,
the system should generate around 350 kWh heat per square meter (10.76
square ft).


BillK